Padding for a motor vehicle seat

Abstract

The invention relates to a padding for a motor vehicle seat having a sheet for measuring multizone pressure. The sheet has a flexible support layer, with a first electrode having first contact elements, a second electrode having second contact elements and a plurality of intermediate contact elements having piezoresistive properties, each of the intermediate elements being inserted between a first and a second element to form a plurality of pressure sensors. The support layer is made of mesh. The first electrode is made from conductive ink printed on the support layer. The second electrode is made from printed conductive ink, and the intermediate contact elements are made from printed conductive ink with less conductivity than the inks of the electrodes.

What is claimed is: 
     
       1. A padding for a motor vehicle seat, the padding comprising:
 a cover upholstering the padding, the cover having an area for receiving a passenger, 
 a sheet for measuring multizone pressure, the sheet extending facing the whole of the area, the sheet comprising means for connection to an electronic system for measuring the pressure exerted by an occupant of the padding at various zones of the area, the sheet comprising: 
 a flexible support layer, 
 a first electrode comprising a plurality of first current-conduction lines, each of the first current-conduction lines having a first end forming a first contact element, 
 a second electrode overlapping the first electrode, the second electrode comprising a plurality of second current-conduction lines, each of the second current-conduction lines having a second end forming a second contact element, 
 each first element being disposed facing a respective second element, 
 a plurality of intermediate contact elements having piezoresistive properties, each of the intermediate elements being inserted between a respective first and second element to form a plurality of pressure sensors formed by a stack of the contact elements, the sensors being distributed over the support layer, 
 an elastically compressible stuffing block, 
 and wherein, 
 the support layer is made of mesh, 
 the first electrode is made from conductive ink printed on the support layer, 
 the second electrode is made from printed conductive ink, 
 the intermediate contact elements are made from printed conductive ink with less conductivity than that of the inks of the first and second electrodes. 
 
     
     
       2. The padding according to  claim 1 , wherein the cover comprises:
 an external cladding layer, 
 a middle comfort layer made from foam, 
 an internal layer made from a mesh forming the support layer. 
 
     
     
       3. The padding according to  claim 2 , wherein:
 the intermediate contact elements are printed on the first contact elements, and 
 the second electrode is printed on the internal layer and on the intermediate elements. 
 
     
     
       4. The padding according to  claim 2 , wherein:
 the second electrode is printed on an additional layer made from mesh disposed towards the stuffing block, the additional layer being glued to the internal layer, and 
 the intermediate contact elements are printed as required on the first or second contact elements. 
 
     
     
       5. The padding according to  claim 2 , wherein the internal layer:
 comprises between 6 and 10 columns of threads/cm and between 5 and 10 rows of threads/cm, 
 has a mass per surface area of between 25 and 50 g/m 2 , and 
 is formed from threads the count of which is between 40 and 120 dtex. 
 
     
     
       6. The padding according to  claim 1 , wherein the cover is fitted on the stuffing block. 
     
     
       7. The padding according to  claim 1 , wherein the cover is at least partly overmoulded by the stuffing block, the block being made of moulded foam. 
     
     
       8. The padding according to  claim 1 , wherein the sheet further comprises at least one impervious and electrically insulating protective layer.